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Torque sensor unit

a technology of torque sensor and torque sensor, which is applied in the direction of instruments, force/torque/work measurement apparatus, transportation and packaging, etc., can solve the problems affecting the detection accuracy of absolute rotation angle, and achieve the effect of accurate determination, excellent positioning ability, and high mounting accuracy of magnets

Inactive Publication Date: 2017-08-22
NTN CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a torque sensor unit that is easy to mount and has high mounting accuracy. The unit includes a shaft member with rolling bearings and a housing, which ensures the alignment and concentricity of the magnets and magnetic sensors. The shaft member can be connected to a device's shaft, making the mounting process easier. The technical effects of this invention include improved mounting accuracy, simplified mounting process, and improved alignment of the magnets and magnetic sensors.

Problems solved by technology

Since a magnetic angle sensor calculates the angle based on the magnetic flux density as detected by the magnetic sensor element, mounting errors of the magnet and the magnetic sensor element significantly influence the detection accuracy of the absolute rotation angle.

Method used

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[0025]Now a torque sensor unit as a first specific example is described with reference to FIG. 1. As shown, this torque sensor unit includes a first rolling bearing 10, a second rolling bearing 20, a housing 30, a shaft member 40, a bearing restricting means 50, a first magnetic angle sensor 60, and a second magnetic angle sensor 70. The magnetic angle sensor 60 is fixed to the rolling bearing 10, while the magnetic angle sensor 70 is fixed to the rolling bearing 20.

[0026]The first rolling bearing 10 includes a first inner race 11, a first outer race 12, and a plurality of rolling elements 13 disposed between the inner race 11 and the outer race 12. The second rolling bearing 20 includes a second inner race 21, a second outer race 22, and a plurality of rolling elements 23 disposed between the inner race 21 and the outer race 22. The rolling bearings 10 and 20 themselves have the ability of position the inner and outer races 11 and 12, and the inner and outer races 21 and 22, respec...

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Abstract

A torque sensor unit includes two magnetic angle sensors capable of detecting absolute rotation angles of a shaft member which indicate a twist angle of the shaft member when the shaft member is twisted. The shaft member has two end portions exposed to outside so that the shaft member can be connected at the two end portions to shaft-forming parts of a device.

Description

TECHNICAL FIELD[0001]The present invention relates to a torque sensor unit used to measure torque applied to a shaft.BACKGROUND ART[0002]Known contact type torque sensors are used e.g., for vehicle steering devices (as disclosed in the below-identified Patent document 1). A non-contact type torque sensor is known which include two magnetic angle sensors arranged coaxial with a shaft and capable of detecting absolute rotation angles. These angle sensors convert the absolute rotation angles, which correspond to the rotational displacement at the respective axial positions, to output signals. When the shaft is twisted under torque applied to the shaft, the shaft is rotationally displaced about its axis to different degrees at two axially separate points. Thus, by detecting the rotational displacements at the two axially separate points as absolute rotation angles, the twist angle between these two axially separate points is given as the difference in output between such absolute rotati...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G01L3/00F16C41/00B62D6/10B62D15/02G01L5/22G01L3/10
CPCG01L3/104B62D6/10B62D15/0215F16C41/007G01L5/221F16C19/06F16C19/54F16C2370/00
Inventor ITOMI, SHOJI
Owner NTN CORP
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